APA (7th ed.) Citation

Serviss, G. P. (2011). Astronomy with an Opera-glass A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments. Project Gutenberg.

Chicago Style (17th ed.) Citation

Serviss, Garrett Putman. Astronomy with an Opera-glass A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Serviss, Garrett Putman. Astronomy with an Opera-glass A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments. Project Gutenberg, 2011.

Warning: These citations may not always be 100% accurate.